<template>
    <div class="subject">
        <span></span>
        <span>+</span>
        <span></span>
        <span>=</span>
        <input type="number" />
        <button>提交</button>
    </div>
</template>

<script>
export default {

}
</script>

<style scoped>
.subject {
    margin: 5px;
    padding: 5px;
    font-size: 20px;
}

.subject span {
    display: inline-block;
    text-align: center;
    width: 20px;
}

.subject input {
    width: 50px;
    height: 20px;
}
</style>